Can anyone tell me, if theres any major difference between the 2011 and 2012 rpm? I can get a couple of 2011 rpms for a good price, but i dont want to buy them unless they flie like the 2012's... Ive tried the 2012 and loved them, but havent tried the 2011.. As far as i can see, there hasn't been any major changes between 2011, 12 and 13..